{
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    "\"\"\"\n",
    "    Platt 的 SMO 算法\n",
    "    * 工作原理\n",
    "        每次循环中选择两个 alpha 进行优化处理。一旦找到一对合适的alpha，那么就增大一个同时减小另一个。\n",
    "        alpha(需要符合两个条件：1、两个alpha必须在间隔边界之外。2、两个alpha还没经过去间化处理，或者不在边界上)\n",
    "\"\"\""
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 2,
   "metadata": {},
   "outputs": [
    {
     "ename": "FileNotFoundError",
     "evalue": "[Errno 2] No such file or directory: 'testSet.txt'",
     "output_type": "error",
     "traceback": [
      "\u001b[1;31m---------------------------------------------------------------------------\u001b[0m",
      "\u001b[1;31mFileNotFoundError\u001b[0m                         Traceback (most recent call last)",
      "\u001b[1;32m<ipython-input-2-bb0108040042>\u001b[0m in \u001b[0;36m<module>\u001b[1;34m()\u001b[0m\n\u001b[0;32m     27\u001b[0m \u001b[1;33m\u001b[0m\u001b[0m\n\u001b[0;32m     28\u001b[0m \u001b[1;33m\u001b[0m\u001b[0m\n\u001b[1;32m---> 29\u001b[1;33m \u001b[0mdataMat\u001b[0m\u001b[1;33m,\u001b[0m \u001b[0mlabelMat\u001b[0m \u001b[1;33m=\u001b[0m \u001b[0mloadDataSet\u001b[0m\u001b[1;33m(\u001b[0m\u001b[1;34m'testSet.txt'\u001b[0m\u001b[1;33m)\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[0m\u001b[0;32m     30\u001b[0m \u001b[0mdataMat\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n",
      "\u001b[1;32m<ipython-input-2-bb0108040042>\u001b[0m in \u001b[0;36mloadDataSet\u001b[1;34m(fileName)\u001b[0m\n\u001b[0;32m      4\u001b[0m \u001b[1;32mdef\u001b[0m \u001b[0mloadDataSet\u001b[0m\u001b[1;33m(\u001b[0m\u001b[0mfileName\u001b[0m\u001b[1;33m)\u001b[0m\u001b[1;33m:\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[0;32m      5\u001b[0m     \u001b[0mdataMat\u001b[0m \u001b[1;33m=\u001b[0m \u001b[1;33m[\u001b[0m\u001b[1;33m]\u001b[0m\u001b[1;33m;\u001b[0m \u001b[0mlabelMat\u001b[0m \u001b[1;33m=\u001b[0m \u001b[1;33m[\u001b[0m\u001b[1;33m]\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[1;32m----> 6\u001b[1;33m     \u001b[0mfr\u001b[0m \u001b[1;33m=\u001b[0m \u001b[0mopen\u001b[0m\u001b[1;33m(\u001b[0m\u001b[0mfileName\u001b[0m\u001b[1;33m)\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[0m\u001b[0;32m      7\u001b[0m     \u001b[1;32mfor\u001b[0m \u001b[0mline\u001b[0m \u001b[1;32min\u001b[0m \u001b[0mfr\u001b[0m\u001b[1;33m.\u001b[0m\u001b[0mreadlines\u001b[0m\u001b[1;33m(\u001b[0m\u001b[1;33m)\u001b[0m\u001b[1;33m:\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[0;32m      8\u001b[0m         \u001b[0mlineArr\u001b[0m \u001b[1;33m=\u001b[0m \u001b[0mline\u001b[0m\u001b[1;33m.\u001b[0m\u001b[0mstrip\u001b[0m\u001b[1;33m(\u001b[0m\u001b[1;33m)\u001b[0m\u001b[1;33m.\u001b[0m\u001b[0msplit\u001b[0m\u001b[1;33m(\u001b[0m\u001b[1;34m'\\t'\u001b[0m\u001b[1;33m)\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n",
      "\u001b[1;31mFileNotFoundError\u001b[0m: [Errno 2] No such file or directory: 'testSet.txt'"
     ]
    }
   ],
   "source": [
    "# SMO 算法中的辅助函数\n",
    "from numpy import * \n",
    "\n",
    "def loadDataSet(fileName):\n",
    "    dataMat = []; labelMat = []\n",
    "    fr = open(fileName)\n",
    "    for line in fr.readlines():\n",
    "        lineArr = line.strip().split('\\t')\n",
    "        dataMat.append([float(lineArr[0]), float(lineArr[1])])\n",
    "        labelMat.append(float(lineArr[2]))\n",
    "    return dataMat, labelMat\n",
    "\n",
    "\n",
    "def selectJrand(i, m):\n",
    "    j = i \n",
    "    while (j==i):\n",
    "        j = int(random.uniform(0, m))\n",
    "    return j \n",
    "\n",
    "\n",
    "def clipAlpha(aj, H, L):\n",
    "    if aj > H:\n",
    "        aj = H\n",
    "    if L > aj:\n",
    "        aj = L\n",
    "    return aj \n",
    "\n",
    "\n",
    "dataMat, labelMat = loadDataSet('testSet.txt')\n",
    "dataMat"
   ]
  }
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